1. One-touch alarm: trigger the alarm immediately with just a single button 2. Smart linkage: seamlessly connect and control other smart devices 3. Long battery life: enjoy long-term use without frequent battery replacement 4. APP notification: receive instant alarms on your smartphone app 5. View history: view past alarm events and notifications<br><br>Wireless protocol: Zigbee3.0 Operating voltage: 3V Battery type: CR2032 Standby current: Less than 8uA Operating temperature: -10 - 55℃ Operating humidity: 0 - 99%RH (The product appearance and printed words depending on the batch, but this does not affect use) Color: As Shown Material: plastic<br><br>Package Contents: 1 * SOS Button<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.